Cam grinding machine



Sept. 2, 1952 E. R. FAUSSET ETAL I 2,608,302

CAM GRINDINGMACHINE Filed April 1, 1950 10 Sheets-Sheet l $31 BY fiwwmg/ T6488 AIME N576 Sep 1952 E. R. FAUSSET ET AL CAM GRINDING MACHINE l0Sheets-Sheet 2 Filed ApI il l, 1950 Sept. 2, 1952 E. R. FAUSSET ETAL2,608,802

CAM GRINDING MACHINE Filed April 1, 1950 10 Sheets-Sheet 5 Sept. 2, 1952E. R. FAUSSET ET AL 2,608,802

CAM GRINDING MACHINE Filed April 1, 1950 10 SheetsSheet 5 Tiff/llATM/11W V5 Sept. 2, 1952 E. R. FAUSSET ET AL CAM GRINDING MACHINE 1OSheets-Sheet 6 Filed April 1, 1950 INVfA/WHS [HA/[57 B. fAUJSi 7', MM E.7000 MW My? Sept. 2, 1952 E. R. FAUSSET ETAL 2,608,802

CAM GRINDING MACHINE Filed April 1, 1950 10 Sheets-Sheet 7 -ZZZII:

[Ii/VAST l2- fAl/JJET IMX f. 7001] mm Aim/vim ept 2, 1 E. R. FAUSSET ETAL CAM GRINDING MACHINE l0 Sheets-Sheet 8 Filed April 1, 1950 lNtf/VMBSm/vm B. fAUSSfT rm 10017 5 Y %/4% Mal 9 Sept. 2, 1952 E. R. FAUSSET ETAL 2,603,802

CAM GRINDING MACHINE:

Filed April 1, 1950 10 Sheets-Sheet 9 %MMw/r% mm Arm/mm S p 2, 1952 E.R. FAUSSET ETAL 2,608,802

CAM GRINDING MACHINE Filed April 1, 1950 i0 Sheets-Sheet 1o 3 lever armsengageable with the cam surfaces 36 of the arms of plate 31, therebycausing annular displacement of the cam 33 relative to the engine drivenshaft whereby ignition timing is advanced as engine speed increases. Inorder that the ignition timing will be advanced properly with anincrease of engine speed, the cams 36 are accurately shaped by grinding.The plate 31 is caused to turn clockwise (Fig. 11) while the shaft 38moves bodily on the arcuate line 38a, said bodily movement beingcontrolled by a master cam, so that the plate 31 will move from the fullline position to the dot-dash line position 31' in a manner such thatthe cam surface 36 is abraded by the wheel 35 to receive the propercontour. Following this abrasion, the plate 31 moves to position 31" andis caused to stop the motor promptly when it is disconnected from thecurrent source. While current is applied to the motor M4, the brake isretracted by an electromagnet in circuit with the motor. Motor M4 issupported by a speed reducer IOI, which, as shown in Figs. 3 and 12, issupported by frame 2I. Throughthe speed reducer, the motor M4 drives ashaft I02 connected with a sprocket I03 which, as shown in Fig. 6, isconnected by a chain I04 with the sprocket 93 (Fig. 5). Chain I04engages an idle sprocket I05 which, for purpose of taking up slack inthe chain I04, is mounted for vertical adjustment on to turn aboutone-fourth revolution as the plate 31 returns to the full line position,thereby reversing the position of the arms of the plate 31.

To'obtain these movements, the plate 31 is mounted upon a rotating andoscillating work support 40 which is attached to a rod M which snuglyreceives the tubular shaft 38. The angular locati'on of the plate 31relative to the work support 40 is fixed by hole 42 which receives stud43 attached to plate 31. Hole 42 is vented by cross passage 44 insupport 40. To provide clearance for the wheel 35, the support 40 hasnotches 45.

Referring to Fig. 5, the work support 40 has an integral flange 50 whichscrews 5| (Fig. 6) attach to the flange 52 of a spindle 53. To securealignment of support 40 and spindle 53, the latter has a centralrecess'which receives an accurately fitting pilot portion 54 of part 40.A nut55 received by the threaded portion 53 of the work support 40clamps against the fiange 50 a master control cam 51. Screws 53 secureto the nut 55 a disc 59 located close to a guard 50 attached to frame 2Iand having a hole SI of such size as to permit the oscillation of thespindle 53. Spindle 53 is journaled in bearings 63 supported'by aswinging frame 64 supported upon. bearings 65 supported by a fixed rod55. Rod 66 is supported by a bracket 51 attached by screws 68 to frame2I and has a flange 63 which screws attach to frame ,2I. End play inspindle 53 is taken up by adjustment of .nuts 1I threaded'on the spindle53 and the end play of frame 64 is taken up by adjustment of nuts 12.The chamber in the swinging frame 64which receives the bearings 63 isclosed at the right end by a seal 13 retained by a disc 14 and, at theleft end, by a cap which receives an air cylinder.1- 6 containing apiston connected with rod 11 which extends through the spindle 53 and isguided by a bearing 18. Rod 11 has a head 13 (Figs. 5 and 5A) receivedby a pocket in a block 80 having a C-notch 80a which receives thatportion of the rod 11 of smaller diameter than the head 13. To block 80are attached two ejector rods BI which when fluid pressure is admittedto the left end of cylinder 10, move to the right to eject the work fromthe rod 4|.

The chamber enclosing bearings 65 is closed by caps 82, each supportinga seal ring 83. The

rod 63 provides a journal 90 which supports roller bearings 9I receivedwithin a hub 92 of a sprocket 93 retained by nuts 94 threadedly engagingthe rod 65. Hub 32 isconnected with a disc 96 which screws 91 connectwith a ring 98 and a sprocket 39'driven by a motor M4 in a manner to bedescribed. r

j Referring toFigs. 2 and 3, motor M4 is under controlby a brake I00which is spring operated a plate I36 (Fig. 9). Plate I06 has slots I01for receiving screws I08. Plate I05 supports a stud I05 which provides ajournal for the sprocket I 05 which is retained on the stud I09 by thewasher III) and a screw III.

Sprocket 33 is connected by a chain H2 (Fig. 6) which is connected witha sprocket II3 (Fig. 5) provided by spindle 53. Chain II21meshes with anidle sprocket II4 which, asshown in Fig. 5,

is journaled on a cylinder II5 having asprocket retaining head IIS.Cylinder. I I5 is integral with 'an eccentric shank II1 which isreceived in abore provided by the swinging frame 34 and which isretained by a nut H8. The loosening of nut H8 permits rotation of theshank II1 so that an adjustment of the axis of the cylinder I I5 can bemade to take up slack in the chainI I2.

It is therefore apparent that motor M4 rotates the spindle 53, therebycausing rotation of; the

workpiece plate '31 and the master control cam 51. During rotation ofcam 51, it is urged to the right in Fig. 6 or to the left in Fig. 4 by aspring I20 retained in a tube I2I having a flange which screws I22attach to frame 2 I. Spring I20 urges to the left a disc I23 threadedlyconnected with a rod I24 and locked in the desired position of I30 isjournaled on a screw I32. which extends through a retaining washer I33and is threaded into a rod I34 and is retained in connection with therod I34 by a nut I35. Rod I34 is guided for horizontal adjustment bybosses I35 and I31 provided by frame 2 I. This adjustment is effected bythe turning of a screw I3Bthreadedly con nected with rod I34 and havinga flange I39 con f fined between discs I40 and MI which screws I42attach to the boss I31. As shown in Fig. 8, rod I34 is retained inadjusted position by pinch blocks I43 which a screw I44 clamps againstthe rod.

Lever I30 pivotally supports a roller I45 which,

the spring I20 (Fig- 4) urges into engagement with the ring 38 which hasthree lands I46, I41

and I48 successively engaged by the roller I45 as sprocket 99 rotates ina clockwise direction (Fig. 6). During one rotation of sprocket 99,

sprocket H3 and hence the plate 31 supported by work-holder 40, rotatesthree times. During a single rotation of sprocket II3, both cam sur-'faces 36 of the arms of plate 31 are caused to engage the grinding wheel35 in the manner determined by the cam 51. During the first of theserotations of the plate 31, the grinding wheel makes a cut of a depthwhich is determined by the adjustmentof rod -I34 (Fig. 6). and by the VThenclutch I55, which controls the 'tool I91. (Fig. 11) and theadvancing of .the wheel 35, is

indicated by. the arm .233, which represents the number of machinecyclesibefore the timer counts or timesiout. Disc 232.carries a pin 235engaged initially'by the lug 235 of a disc 231 rotatable on rod 23I, thelug 230 being urged toward pin 235 by a torsion spring 238 connected atone end-with rod 23I and, at the other end, with a pin 239 attached todisc 231. Lug 236 operates as a-cam to operate a lever 240 pivoted at24! and urged by a spring 242 toward a stop pin 243. The timer times outwhen lug 235 effects right movement of lever 240 to close switches MCIand Disc 231is connected by a. tube 244 journaled on rod 23I with aratchet 245. Spring 238 urges ratchet 245 clockwise to cause a tooththereof to press against a stop pawl 246 pivoted at 241 on a fixedbracket 248 and urged by a spring .249 against the ratchet 245. Ratchet245 is moved step-by-step counterclockwise by a lever 250 journaled onrod 23I and movable by a spring 25I against a stop 252 and against astop 253 by a solenoid S2 which attracts upwardly an armature 254attached to lever v250. Lever 250 carries a pin 255 pivotally supportinga pawl 256 which a spring 25! urges against the ratchet. When solenoidS2 is energized, lever 250 moves clockwise to move the pawl 256. backalong the ratchet. When solenoid S2 is deenergized, spring 251 moveslever 250 counterclockwise to effect movement of ratchet 245 by pawl255. V

The timer reset mechanism comprises a lever 260 .journaled on rod 23Iand urged by a spring 26I into engagement with astop252 and intoengagement with a stop 203 by energization of a solenoid CI whichattracts an armature 204 connected with lever .250. Clockwise movementof lever 200 causes pins 265 and 200 carried thereby to engage tails25'! and 258 respectively of pawls 256 and 245, respectively, to causethem to retract from the ratchet 245 so that spring 238 returns lug 235intoengagement with pin 235 and switches MCI and MC2 open. Solenoid CIis controlled by switch SW8 (mounted on bracket I00, Fig. 12) which iscaused to be closed mo-. mentarily during the latter portion ofcounterclockwise movement of cam I6I (Fig. 12). the end of onerevolution of shaft I54, switch SW8 opens and spring 20I restores lever260 to normal position so that pawls 246 and 255 will engage the.ratchet, 245.

Referring to Fig. 18, current source wires 20I, 202-and 203 areconnectible with grinder motor MI, cooling liquid pump motor M2, dressermotor M3 and spindle motor M4 by magnetic switches having, respectively,coils RI, R2, R3 and R4 which, when energized, respectively, closecontacts Ia, lb, Ic, 2a, 2 2c, 311,311.30 and 4a, 4b, 40,11At a certaintime, motor M4 is connected with wires 20 I, 202 and 203' also by arelay having a coil R6 which, whenenergized, closes contacts 6a, 6b, 6cin parallel respectively, with contacts 4a, 4b, 4c.

Motors MI, M2. M3 and M4 are protected, re-

spectively, by overload circuit breakers having I normally. closed pairsof contacts marked, re-

overload breaker is associated/.1; Wires 20!, 202 are connected to-theof a transformer TI havinga secondary sly connected with wires 204 and205.

When placing the machine in operatiomthe grinder motor MI is started:first. This is ef-. fectedby closingswitch SW2a which energizes coil RIwhich-effectsthe closing of contacts/Ia, 10. I b, It: and Id, the latterbypassing switch SW2d so that motor MI. remains in operation afterswitch SW2d is released. Lamp L3 burns to indicate operation ofthegrinder motor. motors M2 and M3, switch SW4 is closed to effectenergization of coils R2 andgR3 to efiect closing of contacts 2a, 2b, 2cand 2d and contacts 311, 3b, 3c. Since contacts 211, whenlclosed, bypassswitch SW4, motors M2 and M3 remainoperative after. switch SW4 isreleased. Lamp L4 burns, to indi-q cate. operation of motors M2 and M3.

Switch SW5 is normally in position toconnect wires 205 and 201. SwitchSW'I is normally in positionto connect wires 206 and 209 thereby.

leased. Near .the .end .of one revolution of a sprocket 99 (Fig. 6) theswitch SW5 is momentarily moved to disconnect wire 201 from wire 206 tocause .deenergizationof coil R4 and solenoid S2 which controls thetimer. Then solenoid S2 is deenergized to cause the timer to. add onecycle to its previous count. When coil R4 is de- 4o energized, motor.M-4would stop before home position of sprocket 99 (Fig. 6) is reached. Butmomentary disconnection of wires 206, 20115 immediately followed bymomentary connection of wire 20B .with'coil R0 so that contacts 6a, 6b,close momentarily to continue operation of the motor momentarily so thatits momentum will be such that application of the brake after coil R0 isde'energized' will cause the motor M4 to coast sufiiciently to bringsprocket 99 to the iesired home position and to stop after switch SW9has been momentarily closed to efiect ejection of the work andsubsequent retraction of the ejector so that the. holder 40- can bereloaded.

(Fig. 17) is moved against stop 253 preparatory to the next countingoperation. .The machine is now ready for reloading andrepetition of itscycle. I

After the predetermined number of cycles for which the timer is set,the, timer causes its conher of cycles and that the grinding wheel is tobe redressed; and solenoid SI is energized and retracts the latch I5'lof the clutch, I55, and shaft 154 turns to cause axial shifting of thegrinding wheel 35 and operation of the dresser. Before completion of onerevolution of shaft I54. cam I6I closes switch SW8 (Fig. 12) momentarilyto efiect energization of solenoid CI which resets;

' the timer. As previously described, the resetting ment h in a circuitto the motor with which the;

primary pl To start tactsMCt and 'MC2 to close automatically. A lamp L2burns to indicate the'end of said num- ..of. the timer-effects openingof contacts MC] and M02 thereby causing lamp. L2 to. go out and thedeenergizatio'n ofsolenoid. SI whereupon, the

.clutch I55 becomes disengagedatthe end .offlone revolution .of shaftI54. 'lhe machine, is then ready for further, operation.

When thegrinding wheel135 has beendressed down until ,the, dresser. is,in danger of striking the wheel clamp nut,35n (Figll), switch SW1 iscaused toldisconhectwires ZBE-andZBB and to connectwire, 206 withW-ireWZDS. and-lamp Ll hurnsto indicatethat a new, grinding wheel isrequired ,Furthermo'racoil R5 is deenergized to as herein disclosed,constitutes a preferred form,

it'is to be understood that other forms might be adopted.

What is claimed is as follows:

1. A machinefor grinding a. contour on an edge of a blank andcomprising,a grinding wheel having a .plane abrading surface, at right angles toits axis of rotation, means for rotating the wheel, a shaft supportedforrotationvon an axis parallel to the abradingj surface andjoifset fromthe wheel axis, means supporting the shaft for lateral displacementrelative to the wheel, a master cam supported bythe shaft, a relativelyfixed cam follower'engaged by the cam, said cam having a contourtforcausing lateral displacement of the shaft coordinated with angularposition thereof, a work-holder attached to theshaft and supporting theblank in such position that a portion of .its edge relatively near tothe shaft axis is engaged by a portion of the abrading surfacerelatively far from, the wheel axis when the shaft is positioned by thecam close to the wheel asthe shaft rotates and, when the shaft ispositioned by the cam further from the wheel as'the shaftrotates, aportion ,of the abrading surface closer to wheel axis engages a portionof, the blank edge more. remote from the shaft axis and a mechanism forimparting to the shaft rotary movement at lesser speed as theshaft moveslate'rally from'the wheel and at greater speed as the shaft moveslaterally toward the wheel whereby, as abrasivespeed is greater or less,rotative speed of theshaft is greater or less,

2. A machine .for grinding a contour on an edge of a blank, andcomprisinga fixed frame, a swinginglframe supported for oscillation bythe 'fixed frame, a, shaft .supportedby the swinging frame on anaxisparallel, to the axis of'oscillation of the swinging frame, agrinding wheel having, a plane, ,blank-dse-abrading surface,meansrotatably supportingthe, wheel so that the abrading surfaceisparallel to the shaft axis and 'so that'the axisof the wheel is offsetfrom theshaft. axis, means for, rotating thev wheel, a relatively fixed.cam,follower, a master cam supported by the shaftfor causing lateraldisplacement; thereof coordinated with;- angular pos o s thereofrasithegshait is vrotated',ia rotary motion transmitting meanscomprising a sprocket coaxial with the axis of oscillation of theswinging frame, a sprocket on the shaft and a chain connecting thesprockets whereby lateral displacement" of the shaft away from the.wheel is accompanied by rotation of the shaft" in a certain directionand in the oppositedirection when the shaft is displaced towardthewheel, means for rotating the first sprocket in such direction thatrotation of theshaft by the transmitting means is in adirectionroppositeto the direction of shaft rotation due to lateralmovement'of the shaft away from the wheel, a work-holder attached to theshaft andsup'porting a blank in such position that a portion of itsedgerelatively near to the shaftaxisis engaged by 'a portion of theabrading surface relatively far from the wheel axis whenithe shaftcispositioned byithe cam close to the wheel and, whenthe .shaft ispositioned by the cam further from the wheel, a portion of the abradingsurface] closer. to the wheel axis engages a portion of the blank edgemore remote from the shaft axis in consequence of which, as. abrasionspeed is greateror less, rotative speed of the shaft isgreater or less;

3. A machine for grinding a contour on an edge of a blank andvcomprising, a grinding wheelhaving a plane abradingsurface at rightangles to its axis of rotation, means for rotating wheel, a shaftsupported for rotation .on anaxis parallel to. the abrading surface andoffset from the wheel axis, means supporting the'shaft, for lateraldisplacement relative to the. wheeL. a master cam supportedby the shaft,a relatively fixed cam follower engagedbythe cam, said cam having acontour for causing lateraldisplacement of the shaft coordinated withangulanposiftion thereof,,a work-holder attachedtothe shaft andsupporting the blank in such position that a, portion of its edgerelatively near to the shaft axis is engaged by a portion of theabrading surface relatively far from the wheel axis when the shaft ispositioned by the cam close toithe wheel as the shaft rotates and, whenthe shaft is positioned by, the cam further from the wheel as the shaftrotates, aportion of the abrading surface, closer to the wheelaxisengages ,3 ortio of the blank edge more remote from the vshaft axis, amechanism for rotating. the shaft aplurality of turns to cause the blank,to contact the abrading surface va. plurality of times,, and meansunder control by said mechanism for changing position .of the camfollower. to ,cause the blank to be locatedcloser to. the wheel in, asucceeding abrasion operation than in a preceding one. r .-I

4. A machine for grinding a contourv on the edge of a blankand-comprising arotaryshaft, a work-holder on. the shaft for supporting'the blank, a supportfor the shaft capableof lateral movement, a:cam-follower, a'master cam sup,- ported by the shaft and engaged by thecam and having 7 a contour suchas to cause lateralrmovementv of theshaft coordinated with angular posi tionsrthereof, an abrasion device.engaged by the blank-as the shaft rotateslit and the. cam-poshtionsit bylateral movementof the shaft support, mechanism for rotating, the shaft,and means operated by the mechanism formoving thev cam follower, aftercompletion of an abrasion opera:- tion on an arm of the blank, in adirectionsuch that the blank is moved closer to the, abrasion devicethanduring the preceding, abrasion opera,- tion on said arm of the blank.

5. A machine accordingto claimshaving means for stopping rotation of theshaft after completion of a predetermined number of: abrasionoperations.

comprising a fixed frame, a swinging frame supported for oscillation bythe fixed frame, a shaft supported by the swinging frame on an axisparallel to the axis of oscillation of the swinging frame, a grindingwheel having a plane, blankedge-abrading surface, means rotatablysupporting the wheel so that the abrading surface is parallel to theshaft axis and so that the axis of the wheel is offset from the shaftaxis, means for rotating the wheel, a relatively fixed cam follower, amaster cam supported by the shaft for causing lateral displacementthereof coordinated with angular position thereof as the shaft isrotated, a work-holder attached to the shaft and supporting the blankfor engagement with said abrading surface of the wheel in a .mannerdetermined by the cam in coordination with angular position of theshaft, said cam contour also being such that, following an abrasion ofone arm of the blank, the blank is retracted from the wheel and isturned during oscillation of the swinging frame to present the other armof the blank to the wheel so that both arms are abraded once each duringone revolution of the shaft, means for rotating the shaft and includinga driving sprocket coaxial with the axis of oscillation of the swingingframe, a driven sprocket on the shaft and a chain connecting thesprockets, the diameter of the driving sprocket being three times thediameter of the driven sprocket, a movable support for themaster camfollower, a second cam follower connected with the support, a second cammoving with the driving sprocket at the same speed and having threearcuate lands each of about 120 angular dimension and of differentradii, and a spring which urges the master cam against the master camfollower and causes the master cam follower support to cause the secondcam follower con- ,nected with said support to be urged against theframe, a grinding wheel having a plane, blankedge-abrading surface,means rotatably supporting the wheel so that the abrading surface isparallel to the shaft axis and so that the axis of the wheel is offsetfrom the shaft axis, means for rotating the wheel, a relatively fixedcam and supporting the blank for engagement with said abrading surfaceof the wheel in a manner determined by the cam in coordination withangular position of the shaft, said cam contour also being such that,following an abrasion of one arm of the blank, the blank is retractedfrom the wheel and is turned during oscillation of the swinging frame topresent the other arm of the blank to the wheel so that both arms areabraded once each during one revolution of the shaft, means for rotatingthe shaft and including a driving sprocket coaxial with the axis ofoscillation of the swinging frame, a driven sprocket on the shaft and achain connecting the sprockets, the diameter of the driving sprocketbeing three times the diameter of the driven sprocket, a leversupporting at one end the master cam follower, a second cam followersupported by the other end of the lever, a second cam mounted on thedriving sprocket and having three arcuate lands each of about angulardimensions and having progressively shorter radii, an adjustable fulcrumrod supporting the lever between its ends, and a spring which urges themaster cam against the master cam follower and causes the lever to pressthe second cam follower against the second cam whereby the shaft iscloser to the wheel preparatory to the second abrasions of both armsthan for the first abrasions thereof and is closer to the wheelpreparatory to the third abrasions of both arms than for the secondabrasions thereof.

9. In a machine for grinding a contour on a blank, the combinationcomprising, a rotary grinding wheel having a flat abrading surface forengaging the blank, a mechanism for turning the blank while moving itedgewise relative to the abrading surface to present different portionsof the blank edge successively to said surface and including a driveshaft which rotates once for each cycle of abrading operations, anelectric motor for driving said shaft, a relay switch including a magnetcoil and operable by energizing its coil to connect the motor with acurrent source, manually operable means for causing energization of therelay coil, a first switch which, when actuated from normal status,causes deenergization of the relay coil, a second switch, means actuatedby the shaft as it nears completion of one revolution for actuating saidswitches in succession, and means controlled by the second switch, whenactuated, for causing ejection of a blank.

10. In a machine for grinding a contour on a blank, the combinationcomprising a rotary grinding wheel having a flat abrading surface forengaging the blank, a mechanism for turning the blank while moving itedgewise relative to the abrading surface to present different portionsof the blank edge successively to said surface and including a driveshaft which rotates once for each cycle of abrading operations, anelectric motor for driving said shaft, first and second relay switcheseach including a magnet coil and operable by energizing its coil toconnect the motor with a current source, manually operable means forcausing energization of the first relay magnet coil, a switch having afirst or normal status in which it permits energize,- tion of the firstrelay magnet coil and prevents energization of the second relay magnetcoil and having a second status for causing deenergization of the firstrelay magnet coil and energizetion of the second relay magnet coil, acam vmoved by the shaft for momentarily actuating said switch from firstto second status as one revolution of the shaft is nearly ended, asecond 13 switch actuated by said cam after it has actuated the firstswitch and means controlled by the second switch, when actuated, forcausing ejection of a blank.

11. In a machine for grinding a contour on a blank, the combinationcomprising a rotary grinding wheel having a flat abrading surface forengaging the blank, a mechanism for turning the blank while moving itedgewise relative to the abrading surface to present different portionsof the blank edge successively to said surface and including a driveshaft which rotates once for each cycle of abrading operations, an

electric motor for driving said shaft, a relay switch including a magnetcoil and operable by energizing its coil to connect the motor with acurrent source, manually operable means for causing energization of therelay coil, a first switch which, when actuated from normal status,causes deenergization of the relay coil, means moved by the shaft as itnears completion of one revolution for momentarily actuating said switchto effect deenergization of the relay ma net coil, a cycle countingtimer, means under control by said switch when momentarily actuated forcausing the timer to add, a second switch closed by the timer when ithas counted to a certain number, a second mechanism for dressing theabrading surface of the wheel and for moving the wheel axially, a powerdriven second shaft for actuating said second mecha nism during onerevolution of the shaft, a onerevolution clutch for connecting thesecond shaft with the second mechanism, a solenoid energized by theclosing of the second switch for causing the clutch to connect the shaftwith the second mechanism, a third switch closed momentarily duringrotation of the second shaft and a second solenoid energized by closingof the third switch for causing the timer to be reset whereby the firstsolenoid is deenergized and the second mechanism is disconnected fromthe second shaft at the end of one cycle of operation of the secondmechanism.

' ERNEST R. FAUSSET.

MAX E. TODD.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name I Date 957,392 Thiel May 10, 19101,883,016 Shippey et a1. Oct. 18, 1932 1,901,236 Guild Mar. 14, 1933FOREIGN PATENTS Number Country Date 664,143 Germany Aug. 20, 1938

